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<I>Hibiscadelphus Giffardianus</I>

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<I>Hibiscadelphus Giffardianus</I> ISSN (print) 0093-4666 © 2010. Mycotaxon, Ltd. ISSN (online) 2154-8889 MYCOTAXON doi: 10.5248/113.273 Volume 113, pp. 273–281 July–September 2010 Some new pyrenomycetous and loculoascomycetous fungi on the endemic Hawaiian plant Hibiscadelphus giffardianus Larissa N. Vasilyeva1 & Jack D. Rogers2 [email protected] & [email protected] 1Institute of Biology & Soil Science, Far East Branch of the Russian Academy of Sciences, Vladivostok 690022, Russia 2Department of Plant Pathology, Washington State University Pullman, WA 99164-6430, USA Abstract — The fungal associates of the rare tree Hibiscadelphus giffardianus were studied. Three of these (Eutypella giffardiani, Thyridaria hawaiiensis, and Valsonectria macrospora) are described and illustrated as new to science. Key words — Ascomycota, Hawai’i, taxonomy Introduction Several unknown pyrenomycetous and loculomycetous fungi inhabiting dead branches of Hibiscadelphus giffardianus Rock (a Hawaiian endemic in the Malvaceae) were collected by J.D. Rogers in 2005; three of these species are described below. The Hawaiian Islands have the very high (90%) degree of endemism associated with an exceptionally diverse flora (Kim et al. 1998). For the mushrooms, 46 of 310 species are endemic Hawaiian taxa (Hemmes & Desjardin 2002). Other fungal groups (Capnodiales, Chaetothyriales, Coronophorales, Corticiales, Diaporthales, Diversisporales, Dothideales, Erysiphales, Helotiales, Hymenochaetales, Meliolales, Microthyriales, Myriangiales, Phyllachorales, Pleosporales, Uredinales, Xylariales) also have endemic Hawaiian representatives (Stevens 1925; Petrak 1952, 1953; Goos 1970; Sutton & Hodges 1983; Hodges & Gardner 1984; Hodges 1985; Barr & Hodges 1987; Gardner 1988, 1990, 1996; Goos & Uecker 1992; Koske & Gemma 1995; Gilbertson & Nakasone 2003; Rogers et al. 2003, 2006, 2007, 2008; Scholler & Aime 2006). We are not aware of any other reports of fungi on Hibiscadelphus. This paper contributes to a better understanding of the uniqueness of Hawaiian mycobiota. 274 ... Vasilyeva & Rogers Materials and methods Microscopic analyses were carried out using standard techniques. Observations, measurements, and photographs of asci and ascospores were made using Zeiss Primo Star and Leica MZ75 microscopes, G10 and Canon Power Short S40 digital cameras, as well as AxioVision software. Photographs of stromata were taken using a Nikon D40x digital camera. Measurements of asci and ascospores were made in water mounts. Colors follow those of Rayner (1970). Taxonomic descriptions Eutypella giffardiani Lar.N. Vassiljeva & J.D. Rogers, sp. nov. Figs. 1A–B MycoBank MB 518314 Stromata cortice erumpentia, valsoidea, gregaria, parte immersa nigro limitata, circular vel ellipsoidea, disco ostiolato nigro, 1–2 mm diam., praedita. Perithecia profunde immersa, monosticha, globosa, 300–350 µm diam.; collis leniter elongatis, sulcatis, 230–250 µm diam. Asci fasciculati, paraphysati, unitunicati, octospori, clavati vel fusoidei, membrana apicem versus incrassata, annulo apicali in liquore iodato Melzeri cyanescente, partibus sporiferis 25–35 × 4.5–5 µm, stipitibus 15–25 µm longitudine. Ascosporae unicellulares, allantoideae, irregulariter biseriatae vel conglobatae, subolivaceae, 6–8 × 1.7–2 µm. Holotype: Hawai’i, Island of Hawaii, Hawaii Volcanoes National Park, Kipuka Puaulu (Bird Park), dead branches of Hibiscadelphus giffardianus, 3 November 2005, Jack D. Rogers (BISH). Isotype: VLA. Stromata erumpent through the bark, valsoid, aggregated, bounded internally by a black zone line, circular to elliptical, with ostiolar disc 1–2 mm diam., surface black. Perithecia deeply embedded, globose, 300–350 µm diam.; perithecial necks somewhat elongate, sulcate, 230–250 µm diam. Asci in paraphysate fascicles, unitunicate, eight-spored, clavate or spindle-shaped, with tiny amyloid apical ring, p. sp. 25–35 × 4.5–5 µm, with stipes 15–25 µm long. Ascospores one-celled, overlapping and irregularly biseriate or crowded, allantoid, subolivaceous, 6–8 × 1.7–2 µm. Comments—Numerous species of Eutypella have been described. They are difficult to differentiate, and the identification key by Rappaz (1987) offers the most useful information. Two ranges of ascospore average length (5–8 µm and 7–11 µm), which are repeated many times in the key, characterize large groups in the genus. The specimen from Hawaii falls into the group with smaller size range. The ascospore width correlates well with length, and almost all species with ascospores 5–8 µm long are narrower than 2 µm, whereas species with an ascospore length of 7–11 µm have ascospores wider than 2 µm (most often 2–2.5 µm). As there are 21 species with an ascospore length of 5–8 µm (Rappaz 1987), it is important to find other differences to distinguish between them. Two species [E. comosa (Speg.) Rappaz, E. leucaenae Rehm] are rare exceptions that can New ascomycete species on Hibiscadelphus (Hawai’i) ... 275 Fig. 1. Eutypella giffardiani. A. Stromata. B. Ascus and ascospores. Scale bars: A = 1 mm; B = 6 µm. be easily separated by ascospores that are more than 2 µm broad, and another species, E. hunanensis Rappaz, produces very narrow ascospores less than 1.2 µm wide. Six species [E. arecae (Syd. & P. Syd.) Rappaz, E. bonariensis Speg., E. gliricidae Rehm, E. prunastri (Pers.) Sacc., E. sorbi (Alb. & Schwein.) Sacc., E. theobromicola Wakef.] display a J-negative reaction of the ascal apical ring that contrasts with a J-positive one in the Hawaiian specimen. Another character differentiating species of Eutypella is the size of the ostioles. Eutypella androssowii Rehm and E. tetraploa (Berk. & M.A. Curtis) Sacc. have ostioles with a diam of 100–150 µm and 100–180 µm, respectively, whereas 200 µm diam ostioles occur in E. andicola Speg., E. atropae (Mont.) Sacc., and E. capensis Rappaz; 150–200 µm diam ostioles are observed in E. padina (Nitschke) Nannf. and E. sarcobati Ellis & Everh. Ostioles in E. extensa (Fr.) Sacc. are 180–220 µm diam, compared to a diameter ~220–250 µm in the Hawaiian specimen. As such, they correspond to E. alsophila (Durieu & Mont.) Berk. in the group with the range in ascospore length of 5–8 µm. However, 276 ... Vasilyeva & Rogers E. alsophila falls into the group with 400–600 µm diam perithecia, not the group with 200–400 µm diam perithecia. The Hawaiian specimen belongs to the group with 200–400 µm diam and the combination of the other diagnostic features — ascospore, ostiole, and perithecial sizes and the J-positive apical ring — corresponds to the sole remaining species, E. kochiana Rehm. There is no information about ostiolar size in E. kochiana, but it has smaller ascospores than the Hawaiian specimen. Although Rappaz’s key (step 6) identifies the length ascospore group (5–7.5 µm) where E. kochiana appears to belong, the length range of its 4.5–6 µm diam ascospores does not overlap with that in the Hawaiian specimen. Recently, E. alsophila, E. arecae, E. comosa, E. gliricidae, and E. kochiana were transferred to the re-instated genus Peroneutypa Berl. based on ascus morphology (Carmarán et al. 2006). The asci in this genus were described as urn-shaped but with a truncated apex and wider in the middle where ascospores tend to cluster. The apical portion has a thick wall and very small apical ring and lacks any channel. The asci in Eutypella giffardiani from Hawaii have a thick- walled apical region that is penetrated by a narrow channel with cytoplasmic strands connecting the apex with the ascus cytoplasm. This kind of ascus is considered to be typical of true species of Eutypella (Carmarán et al. 2006). After the publication of Rappaz’s (1987) monograph, several new species of Eutypella were described (Agarwal & Gupta 1988; Rajak et al. 1988; Ananthapadmanaban 1989), some of which form ascospores averaging 5–8 µm long (e.g., E. pongamiae G.P. Agarwal & S. Gupta). However, as information about the iodine reaction of the ascal apical ring and ostiole size is lacking, it is difficult to make a proper comparison. Eutypella ceibae R.C. Rajak et al. has a comparable ascospore length (4–8 µm), but a width of 2.5–6 µm is indicated (a very unusual range, and data on the ascal apical ring in asci and ostiolar size are also wanting). Three other species from India — “E. annonae-squamosae” A. Pande, “E. colebrookiae-oppositifoliae” A. Pande, and E. rozabaghensis (Srinivas. & P.G. Sathe) A. Pande, which were originally described in Quaternaria Tul. & C. Tul. (Srinivasulu & Sathe 1970, Kale & Kale 1972) and later transferred to Eutypella either invalidly (as nom. nov.) or as comb. nov. (Pande 2008) — produce ascospores averaging 7–11 µm long and wider than 3 µm. Therefore, the Hawaiian specimen differs from them. Thyridaria hawaiiensis Lar.N. Vassiljeva & J.D. Rogers, sp. nov. Figs. 2A–E MycoBank MB 518317 Stromata valsoidea, mollia, cortice erumpentia, disco ectostromatico pulvinato vel hemisphaerico, castaneo, up to 1.5 mm diam. praedita, intus rubiginosa, ligno circa peritheciis nigra. Perithecia globosa, 300–400 µm diam.; ostiolis leniter papillatis, nigris. Asci longe clavati vel cylindrici, sessiles vel short-stipitati, 100–110 × 12–14 µm, juvenilis New ascomycete species on Hibiscadelphus (Hawai’i) ... 277 Fig. 2. Thyridaria hawaiiensis. A. Stromata. B–C, E. Asci and ascospores. D. Ascospores. Scale bars: A = 1 mm; B = 15 µm; C = 50 µm; D,E = 12 µm. 278 ... Vasilyeva & Rogers crasse tunicati; paraphysibus numerosis, hyalinis, longissimis, sinuosis, ca. 1 µm latis. Ascosporae uni- vel biseriatae, ellipsodeae vel fusoideae, rectae, inaequilateralia vel leniter cirvatae, 3-septatae,
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